package sample;

import lombok.Data;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.WebApplicationType;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class Sample {
  public static void main(String[] args) {
    new SpringApplicationBuilder(Sample.class).web(WebApplicationType.NONE)
        .properties("sample.used.calculator=first")
        .run(args);
  }

  @Bean
  ApplicationRunner sampleRunner(Calculator calculator) {
    return args -> System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>" + calculator.calculate(new Parameter(3)));
  }

  @Bean
  @ConditionalOnProperty(prefix = "sample.used", name = "calculator", havingValue = "first", matchIfMissing = true)
  FirstCalculator firstCalculator() {
    return new FirstCalculator();
  }

  @Bean
  @ConditionalOnProperty(prefix = "sample.used", name = "calculator", havingValue = "second")
  SecondCalculator secondCalculator() {
    return new SecondCalculator();
  }
}

interface Calculator {
  Result calculate(Parameter parameter);
}


class FirstCalculator implements Calculator {

  @Override
  public Result calculate(Parameter parameter) {
    Integer value = parameter.getValue() * parameter.getValue();
    return new Result(value, getClass());
  }
}


class SecondCalculator implements Calculator {

  @Override
  public Result calculate(Parameter parameter) {
    Integer value = parameter.getValue() * parameter.getValue();
    return new Result(value, getClass());
  }
}

@Data
class Parameter {
  private Integer value;

  Parameter(Integer value) {
    this.value = value;
  }
}

@Data
class Result {
  private Integer value;
  private Class<? extends Calculator> calculator;

  Result(Integer value, Class<? extends Calculator> calculator) {
    this.value = value;
    this.calculator = calculator;
  }
}